You are about to leave the plan b one step website foundation consumer healthcare has provided this link as a resource to you but cannot be held responsible for its content. If you take plan b one step within 24 hours it is about 95 effective but you should know that plan b one step is not as effective as regular contraception so dont take it as your main form . Plan b levonorgestrel is a female hormone that can cause changes in your cervix making it harder for sperm to reach the uterus and harder for a fertilized egg to attach to the uterus
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